It would be cool, if you can raise for Android the target API from 15 to at least 23 (currently 26 is the latest).
Another real cool change would be to switch the orientation from landscape to landscapeSensor, so the mobile device can be used in both landscape views.
With a larger API the app isnāt running in ācompat modeā. It could be, that app build with a real low target will be running not that smooth on newer devices.
PS: And since API 23 Android added runtime permissions. This is a big feature and I know many users who wonāt install an app, without runtime permissions.
But target and minimum api level are 2 different things. Of course you want the highest target api to have for example runtime permissions. But changing minimum api level to higher will cut off some users. Of course targeting < 4.0 is not profitable anymore (admob and other google services wonāt work for example).